Koonce’s journey to the NFL began during his college years when he played for the University at Buffalo Bulls. He had an impressive collegiate career, showcasing his skills as a pass rusher and earning a reputation as a disruptive force on the field. Koonce’s standout performances caught the attention of NFL scouts, leading to his selection by the Las Vegas Raiders in the 2021 NFL Draft. He was chosen in the third round, with the 79th overall pick.